In the video below, the comedy team of Penn & Teller, in less than three minutes, manage to destroy two very popular conspiracy myths concerning the 1963 assassination of U.S. President John F. Kennedy:

1.) Penn dry-fires three shots from a Mannlicher-Carcano bolt-action rifle in a very swift 3.45 seconds. (And he aims before firing each round too.)

And:

2.) The Luis Alvarez "jet effect" theory is substantially proven via a melon test, with the melon moving just as President Kennedy's head did -- TOWARD THE GUNMAN WHO FIRED THE SHOT.

Three minutes to debunk two enduring conspiracy factoids/myths. Not a bad three-minutes' work, I'd say.